Method for determining a gas phase mass fraction and / or gas phase mass flow rate, of a multi-phase medium comprising a liquid phase and a gas phase flowing in a measuring tube, and measuring sensor for this purpose

EP4423462B1Active Publication Date: 2026-06-17ENDRESS HAUSER FLOWTEC AG
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
ENDRESS HAUSER FLOWTEC AG
Filing Date
2022-10-25
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Existing methods for determining the mass fraction and mass flow rate of a gas phase in a multiphase medium suffer from reduced measurement accuracy and require large, cumbersome setups, as seen in the use of V-cone arrangements for differential pressure measurements.

Method used

A method and device utilizing a measuring tube with at least three pressure tap points, strategically positioned to account for flow dynamics, including a separation edge, to determine gas phase mass fraction and flow rate by analyzing specific pressure drops and incorporating a monotonic function of these drops, with sensors positioned to maximize sensitivity and accuracy.

Benefits of technology

Enhances measurement sensitivity and accuracy of gas phase mass fraction and flow rate determination, reducing setup size and complexity while maintaining precision.

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Abstract

The invention relates to a method (300, 400) for determining a gas phase mass fraction or mass flow rate, of a multi-phase medium in a measuring tube which comprises a break-away edge exposed to an incident flow and three pressure tap points influenced differently by the break-away edge, said method comprising the steps of: determining a first pressure drop (310; 410) between a first and a second of the pressure tap points which are impinged by the flowing medium; determining a second pressure drop (310; 410) between two pressure tap points which are each impinged by the flowing medium, one of the pressure tap points for determining the second pressure drop being a third of the at least three pressure tap points; and determining the mass fraction (330) or the mass flow rate (460) of the gas phase by means of the pressure drops, the first pressure tap point being arranged upstream of the break-away edge and both the second pressure tap point and the third pressure tap point downstream thereof, one normal vector being substantially axis-parallel to the second pressure tap point and one normal vector being perpendicular to the third pressure tap point, the second and the third pressure tap point being positioned approximately equally in the measuring tube longitudinal direction, the second pressure tap point being positioned at or close to a pressure minimum.
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